CODEWITHSUNDEEP
c#xamlwindows-phone
Ciprian Jijie
Ciprian Jijie

Reputation: 477

Access a image control in another page, class windows phone

Can access an control (image) from another class in C#, XAML? For example: In class A (image) is collapsed/hidden, when check if image is collapsed/hidden in class B, i want to be visible/enabled, it's possible? Thanks!

enter image description here

Upvotes: 0

Views: 118

Answers (1)

Bruno Serrano
Bruno Serrano

Reputation: 565

You can use the PhoneApplicationService to do it.

For example:
Suppose you navigated from class A to class B.
In class B, before you navigate back to class A, set

PhoneApplicationService.Current.State["showImage"] = true;

In class A, implement OnNavigatedTo to handle it:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    if (PhoneApplicationService.Current.State.ContainsKey("showImage"))
    {
        bool showImage = (bool)PhoneApplicationService.Current.State["showImage"];
        if (showImage)
        {
            this.YourImage.Visibility = System.Windows.Visibility.Visible;
        }
        else
        {
            this.YourImage.Visibility = System.Windows.Visibility.Collapsed;
        }

        PhoneApplicationService.Current.State.Remove("showImage");
    }
}

EDIT:

For multiple images, you can try the following approach:

In class B, instead of passing a bool to the PhoneApplicationService, pass a Dictionary of bools, each one representing the state of a image:

var showImage = new Dictionary<int, bool>();
showImage[1] = true;
showImage[2] = false;
showImage[3] = true;
PhoneApplicationService.Current.State["showImage"] = showImage;

In class A, create a dictionary for your images:

private Dictionary<int, Image> _images = new Dictionary<int, Image>();

Then in its constructor, fill the dictionaries with your Images:

InitializeComponent();

_images[1] = YourImage1;
_images[2] = YourImage2;
_images[3] = YourImage3;

In class A's OnNavigatedTo, do:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    if (PhoneApplicationService.Current.State.ContainsKey("showImage"))
    {
        var showImage = PhoneApplicationService.Current.State["showImage"] as Dictionary<int, bool>;
        if (showImage != null)
        {
            foreach (var key in showImage.Keys)
            {
                if (_images.ContainsKey(key))
                {
                    if (showImage[key])
                    {
                        _images[key].Visibility = System.Windows.Visibility.Visible;
                    }
                    else
                    {
                        _images[key].Visibility = System.Windows.Visibility.Collapsed;
                    }
                }
            }
        }
    }
}

If you prefer, you can change the key of the dictionaries for a more representative string.

Hope it helps! :)

Upvotes: 1

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